CN114318890A - Light compression-resistant warp-knitted elastic leather-like fabric and preparation process thereof - Google Patents
Light compression-resistant warp-knitted elastic leather-like fabric and preparation process thereof Download PDFInfo
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Abstract
The invention discloses a light compression-resistant warp-knitted elastic leather-like fabric and a preparation process thereof, and belongs to the technical field of warp-knitted leather-like fabrics and production thereof. The invention utilizes a fabric with an integrated warp knitting sandwich structure woven by a 4-bar double-needle-bed warp knitting machine as a base material of the imitation leather fabric, and the base material is compounded with the elastic polyurethane coating to obtain the light compression-resistant warp knitting elastic imitation leather fabric; wherein, the guide bar GB1 and the guide bar GB2 are fully worn and only form a surface layer on the front needle bed; a guide bar GB3 is fully penetrated and connected with the front needle bed and the rear needle bed to form a sandwich layer of a sandwich structure; the guide bar GB4 is fully worn and is looped only on the back needle bed to form a base layer; the guide bar GB1 adopts elastic yarns, and the guide bar GB2, the guide bar GB3 and the guide bar GB4 adopt inelastic yarns; meanwhile, a sinker with two jaws is adopted in the weaving process, the height of the jaw 1 is higher than that of the jaw 2, the elastic yarn passes through the jaw 1, and the inelastic yarn passes through the jaw 2, so that the warp feeding amount of the elastic yarn is 600-800 times larger than that of the inelastic yarn.
Description
Technical Field
The invention relates to a light compression-resistant warp-knitted elastic imitation leather fabric and a preparation process thereof, belonging to the technical field of warp-knitted imitation leather fabrics and production thereof.
Background
The leather-like fabric with a certain thickness is of a common three-layer structure, wherein one layer adopts knitted fabric as a surface layer, the core layer adopts sponge or other elastic materials, the third layer adopts superfine fiber non-woven fabric or woven plain cloth as a base layer, the surface layer, the core layer and the base layer are bonded by an adhesive, the base layer is compounded with elastic polyurethane, the processing flow is long, the production cost is high, and the requirements of environment-friendly and green production are difficult to achieve. And the superfine non-woven fabric or the woven plain cloth of the base layer has no extensibility and elasticity, and is not consistent with the elasticity and the resilience of the elastic polyurethane of the coating layer on the surface.
In order to improve the elasticity of the leather-like fabric, spandex is used as elastic fiber to improve the elasticity of the surface layer knitted fabric, but the spandex cannot resist high temperature and acid-base environment, creep relaxation can occur after long-term use, the elasticity of the fabric is poor, a special spandex warping machine is needed for warping before warp knitting and manufacturing, and spandex yarn breakage is easy to occur when the spandex is knitted on a double-needle bed. The multilayer structures of the surface layer, the core layer and the base layer are easy to slide under the action of shearing force, and the sponge can lose efficacy after being used for a long time, so that the imitation leather fabric loses the compression resistance. More importantly, if the leather-like fabric adopts elastic fibers as raw materials to prepare the surface layer so as to provide elasticity, and when the base layer adopts inelastic fibers, the surface layer and the base layer have larger shrinkage difference due to inconsistent elastic recoverability of the surface layer and the base layer when the fabric is subjected to finishing and sizing, so that the fabric is wrinkled.
Disclosure of Invention
[ problem ] to
The prior leather-like fabric has long preparation and processing flow and high production cost; and wrinkling is likely to occur.
[ solution ]
In order to solve the problems, the invention provides the light compression-resistant warp-knitted elastic leather-like fabric which is efficient in preparation method, capable of avoiding slippage among multiple layers of materials, improving flatness and more environment-friendly in production. The invention utilizes a 4-comb double-needle bed warp knitting machine to weave an integrated warp knitting sandwich structure fabric as a base material of the imitation leather fabric; the warp knitting sandwich structure fabric is padded with yarns only on a front needle bed by using four guide bars, wherein the guide bars GB1 and GB2 are fully penetrated, a face layer is formed by adopting a knitting chain and a weft insertion tissue, and the guide bar GB3 is fully penetrated by polyester monofilaments and is connected with the front needle bed and the rear needle bed to form a sandwich layer of a sandwich structure, so that the warp knitting sandwich structure fabric has the compression resistance; the guide bar GB4 is fully worn and only forms a loop on the back needle bed, and a base layer is formed by a warp flat structure; the surface layer and the base layer of the warp knitting sandwich structure fabric are made of PBT yarns or PBT/PET composite yarns which are interwoven with other raw materials, and the PBT yarns or the PBT/PET composite yarns have certain elasticity, so a special sinker with two jaws is adopted on a double-needle bed warp knitting machine, wherein the PBT yarns or the PBT/PET composite yarns pass through the jaws 1, and the inelastic yarns pass through the jaws 2; because the height of the jaw 1 is higher than that of the jaw 2, the yarn feeding amount of the PBT yarn or the PBT/PET composite yarn is larger than that of other raw materials, so that the shrinkage size difference of a surface layer and a base layer is reduced during shaping and finishing, the flatness of the fabric is improved, the elasticity and fatigue resistance of the fabric are met, and warping can be performed on a common warping machine; the base layer of the warp-knitted sandwich structure fabric is compounded with the elastic polyurethane coating to form the warp-knitted elastic leather-like fabric. The fabric has the advantages of four-side elastic effect, light weight, lasting compression resistance, simple production process, reduced processing procedures, energy conservation and environmental protection.
The first purpose of the invention is to provide a method for preparing a light anti-compression warp-knitted elastic leather-like fabric, which utilizes a fabric with an integrated warp-knitted sandwich structure woven by a 4-bar double-needle-bed warp knitting machine as a base material of the leather-like fabric and is compounded with an elastic polyurethane coating to obtain the light anti-compression warp-knitted elastic leather-like fabric; the warp knitting sandwich structure fabric is knitted by four guide bars, the guide bars GB1 and GB2 are fully penetrated and only padding yarns are arranged on a front needle bed, and a surface layer is formed by a knitting chain and a weft insertion tissue; a guide bar GB3 is fully penetrated and connected with the front needle bed and the rear needle bed to form a sandwich layer of a sandwich structure; the guide bar GB4 is fully worn and only forms a loop on the back needle bed, and a base layer is formed by a warp flat structure; the guide bar GB1 adopts elastic yarn, and guide bar GB2, guide bar GB3, guide bar GB4 adopt non-elastic yarn, and simultaneously, the knitting in-process adopts the sinker that contains two lamellas, and the height of lamella jaw 1 is higher than lamella jaw 2, and elastic yarn passes through lamella jaw 1, and non-elastic yarn passes through lamella jaw 2 for elastic yarn's let-off volume is 600 ~ 800 than non-elastic yarn.
In one embodiment of the invention, the elastic yarn comprises one of a PBT yarn and a PBT/PET composite yarn.
In an embodiment of the present invention, the inelastic yarn includes one or more of cotton yarn, wool yarn, viscose yarn, polyester monofilament, and polyester yarn DTY.
In one embodiment of the present invention, the weave of the warp knitted sandwich fabric with a single comb structure and a threading manner is as follows:
GB1 comb: 3-3-3-3/0-0-0-0//, compilations;
GB2 comb: 1-0-0-0/1-2-2-2//, compiete;
GB3 comb: 1-0-1-2/2-3-2-1//, compilations;
GB4 comb: 1-1-1-2/1-1-1-0//, full penetration.
In one embodiment of the present invention, the yarns used for the single comb structure in the weaving of the fabric with the warp-knitted sandwich structure are:
GB1 comb: 50-150D PBT or PBT/PET composite yarn;
GB2 comb: one of 32 s-40 s cotton yarn, 32 s-40 s viscose yarn, Nm 54-70/1 wool yarn and 75-100D polyester yarn DTY;
GB3 comb: 20D-40D polyester monofilament;
GB4 comb: 75-100D polyester yarn DTY.
In one embodiment of the present invention, the ratio of the yarn components adopted by the single comb tissue in the weaving of the fabric with the warp-knitted sandwich structure is as follows:
20-60% of PBT yarn or PBT/PET composite yarn, 0-40% of cotton or wool yarn or viscose yarn, 0-20% of polyester monofilament and 20-50% of polyester yarn DTY; "%" is mass percent.
In one embodiment of the invention, the method for preparing the light compression-resistant warp-knitted elastic leather-like fabric specifically comprises the following steps:
(1) selecting materials: selecting 50-150D PBT or PBT/PET composite yarns, 32 s-40 s cotton yarns or 32 s-40 s viscose yarns or Nm 54-70/1 wool yarns, 20D-40D polyester monofilaments and 75-100D polyester yarns DTY as raw materials;
(2) warping: warping PBT or PBT/PET composite yarns, cotton yarns or viscose yarns or wool yarns, polyester monofilaments and polyester yarns DTY on a computer copying warping machine according to the width and the transverse density according to a certain number of parts;
(3) weaving: weaving by adopting a 4-bar double needle bed raschel warp knitting machine, wherein the PBT yarn or the PBT/PET composite yarn passes through the jaw 1, and other raw materials pass through the jaw 2;
(4) and (3) after finishing: shaping; cooling; compounding the fabric with the warp knitting sandwich structure with the elastic polyurethane coating;
(5) and (6) detecting and packaging.
In one embodiment of the present invention, since the jaw 1 is higher than the jaw 2 in the step (3), a wool gray having a light compression-resistant fabric style is obtained after weaving.
In one embodiment of the invention, the shaping in the step (4) is shaping by a shaper, the temperature of an oven is 140 ℃, and meanwhile, the required width and the gram weight of the cloth are controlled.
In one embodiment of the invention, the warp-knitted sandwich-structured fabric and the elastic polyurethane coating in the step (4) are compounded by coating the elastic polyurethane coating on two sides of the warp-knitted sandwich-structured fabric, wherein the total coating amount of the two sides is 50-100 g/m2(ii) a Then drying at 90-120 ℃ at the drying speed of 10-15 m/min.
The second purpose of the invention is to obtain the light compression-resistant warp-knitted elastic leather-like fabric prepared by the method.
In one embodiment of the invention, the finished product of the light compression-resistant warp-knitted elastic imitation leather fabric has a square meter gram weight of 220-430 g/m2。
The third purpose of the invention is to apply the light compression-resistant warp-knitted elastic leather-like fabric in the preparation of industrial textiles.
[ advantageous effects ]
(1) The base material of the warp-knitted leather-like fabric is formed by one-step weaving, and the process is simple and environment-friendly: the layers of the base material are connected together in a sandwich structure, and the interlayer adhesive is not needed for adhesion, so that the problems of interlayer slippage, hardening of the adhesive and the like are avoided.
(2) The warp-knitted leather-like fabric has light compression resistance, and the selected PBT yarns or PBT/PET composite yarns have comfortable elasticity, so that the problems of yarn breakage in warping and weaving of spandex filaments, poor use fastness and the like are solved.
(3) The invention adopts a special sinker which is provided with two jaws, wherein the height of the jaw 1 is greater than that of the jaw 2, PBT yarn or PBT/PET composite yarn passes through the jaw 1, other raw materials pass through the jaw 2, and thus, the yarn feeding amount of the PBT yarn or PBT/PET composite yarn is greater than that of the other raw materials, so that the size change difference of a surface layer and a base layer fabric is reduced after shaping treatment, and the wrinkle phenomenon of the fabric is improved.
(4) The warp-knitted leather-like fabric provided by the invention adopts the PBT yarn or the PBT/PET composite yarn to be interwoven with the cotton, the wool yarn, the viscose fiber yarn, the polyester yarn DTY and the like, so that the surface layer achieves the effects of skin affinity, moisture absorption, heat preservation, drapability, wear resistance and the like, the polyester monofilament is used as the connecting wire of the middle core layer of the fabric with the sandwich structure, the fabric with the warp-knitted sandwich structure has a certain interval thickness, the compression resilience of the fabric is enhanced, the polyester yarn DTY is adopted for the base layer of the sandwich structure, the fastness is high, and the cost is low.
Drawings
FIG. 1 is a diagram showing the movement of the stitch inlay yarn of each single comb in examples 1 and 2.
Fig. 2 is a schematic view of sinkers used on a double needle bed warp knitting machine.
Fig. 3 is a schematic illustration of the looping of non-elastic yarns in a special sinker.
FIG. 4 is a schematic illustration of looping of a PBT yarn or a PBT/PET composite yarn in a special sinker.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of better illustrating the invention and is not intended to limit the invention thereto.
In the embodiment, the warping process of cotton yarns of the warp knitting machine is optimized, the yarn count of the cotton yarns is 32-40 s, the breaking strength, the breaking elongation, the long staple cotton proportion and the hairiness amount of the yarns are reasonably configured, meanwhile, the twist of the cotton yarns and the number of hairiness of more than 3mm are emphasized, the price is moderate, and the cotton yarns used in the warp knitting machine all meet the requirements;
through the control of hairiness, flying and warping tension, the speed of the warping machine is adjusted to 600-800 r/min, cotton yarn breakage is increased due to overhigh machine speed, production efficiency is affected due to overlow machine speed, and the machine speed range is obtained in practice.
The cotton yarn warping machine is correspondingly modified, the distance between each bobbin support of the bobbin creel is reduced, the size of a cotton yarn bobbin is adapted, a reciprocating type air blowing and sucking channel and a fly collecting device are added, and formed cotton yarn fly is collected.
Example 1
The light compression-resistant warp-knitted elastic leather-like fabric is obtained by compounding a warp-knitted sandwich-structure fabric and an elastic polyurethane coating, wherein the warp-knitted sandwich-structure fabric is composed of the following components in percentage by mass: 20.6% of 100D PBT/PET composite yarn, 37.1% of 32s cotton yarn, 19.7% of 30D monofilament polyester and 22.6% of 100D semi-gloss polyester DTY;
the specific preparation process comprises the following steps:
1. preparation procedure
100D PBT/PET composite yarns, 30D polyester monofilaments, 32s cotton yarns, 75D36F semi-gloss polyester DTY and 100D semi-gloss polyester DTY are selected.
2. Warping process
Temperature and humidity at the warping site: the temperature is 25 +/-2 ℃, the relative humidity is 65 +/-3%, and the high and stable temperature and humidity are favorable for cotton yarn flying, the surface of the polyester fiber is soft, the static electricity is less, the polyester fiber is prevented from being entangled with each other due to the generated static electricity during high-speed warping, and the high-speed production of polyester warp-knitted products is facilitated.
And (3) according to a conventional warping operation flow, finishing the PBT/PET composite yarns, the polyester filament DTY and the polyester monofilaments according to a certain warping head part.
According to the conventional warping operation flow, cotton yarns are arranged according to a certain warping head, the cotton yarns are divided into two layers at intervals by a metal yarn dividing rod during warping, a photoelectric hairiness detection device is closed, white oil is coated on the surface layers of the cotton yarns by an oil filling device, the surface hairiness is made to be attached to the trunks of the cotton yarns, and the flexibility and the knittability of the cotton yarns are improved.
The warping machine is applied with a uniform tension warping technology, namely, a hydraulic damping compensation tensioner is arranged on the warping machine, so that the requirement of warp knitting warping on tension is met.
3. Weaving process
Machine parameters:
the yarn laying movement diagram is shown in figure 1:
model: a double needle bar raschel machine RD 4N;
machine number: 22 needles/25.4 mm;
breadth: 138 inches.
Warp knitting organization structure:
GB1 comb: 3-3-3-3/0-0-0-0//;
GB2 comb: 1-0-0-0/1-2-2-2//;
GB3 comb: 1-0-1-2/2-3-2-1//;
GB4 comb: 1-1-1-2/1-1-1-0//.
Raw materials and a threading mode:
GB1 comb: the 100D PBT/PET composite yarn is fully penetrated;
GB2 comb: 32s cotton yarn, full penetration;
GB3 comb: 30D monofilament terylene fully penetrating;
GB4 comb: 100D half-gloss polyester DTY, full penetration.
Inputting the digital number of the tissue lapping, the let-off amount, the drawing density and the like into a computer display screen of a control cabinet, storing, loading a computer file and starting the machine.
The tension spring of the warp knitting machine tension rod is adjusted, the length of the tension spring of the cotton yarn is lengthened to be 1.5-2.5 times of that of the tension spring for the common polyester filament yarn, the diameter of the tension spring is changed to be 0.5-0.8 time of that of the tension spring for the common polyester filament yarn, and tension compensation of the cotton yarn is increased so as to adapt to strength requirements and high-speed production of the cotton yarn.
The PBT/PET composite yarn passes through the jaw 1, cotton yarn, 30D monofilament terylene and 100D semi-gloss terylene DTY passes through the jaw 2; wherein the jaw 1 is higher than the jaw 2.
And (4) obtaining blank cloth after weaving, weighing, bagging and warehousing the blank.
4. Finishing process
Shaping by a shaper, wherein the temperature of an oven is 140 ℃, and meanwhile, the required width and gram weight of the cloth are controlled; after cooling, the fabric with the warp knitting sandwich structure is compounded with the elastic polyurethane coating, and the total amount of the coating on the two sides is 100g/m2Drying at 120 deg.C at a drying speed of 15m/min, inspecting, weighing, packaging, and warehousing;
through the process, the light compression-resistant warp-knitted elastic imitation leather fabric can be obtained; the fabric with the warp knitting sandwich structure in the fabric is formed by interweaving PBT/PET composite yarns and cotton, so that elasticity is provided, the fabric is skin-friendly and moisture-absorbing, the core layer is made of polyester monofilaments, so that the base material has good compression resilience, and the base layer is made of polyester DTY (draw textured yarn), so that the fabric has certain elasticity consistency with the elastic polyurethane coating film by utilizing the structural elasticity of warp knitting.
The specific production process is shown in a table 1:
TABLE 1
Comparative example 1 No sinker with two jaws
The leather-like fabric is obtained by compounding a fabric with a warp-knitted sandwich structure and an elastic polyurethane coating, wherein the fabric with the warp-knitted sandwich structure comprises the following components in percentage by mass: 20.6% of 100D PBT/PET composite yarn, 37.1% of 32s cotton yarn, 19.7% of 30D monofilament polyester and 22.6% of 100D semi-gloss polyester DTY;
the specific preparation process comprises the following steps:
1. preparation procedure
100D PBT/PET composite yarns, 30D polyester monofilaments, 32s cotton yarns, 75D36F semi-gloss polyester DTY and 100D semi-gloss polyester DTY are selected.
2. Warping process
Temperature and humidity at the warping site: the temperature is 25 +/-2 ℃, the relative humidity is 65 +/-3%, and the high and stable temperature and humidity are favorable for cotton yarn flying, the surface of the polyester fiber is soft, the static electricity is less, the polyester fiber is prevented from being entangled with each other due to the generated static electricity during high-speed warping, and the high-speed production of polyester warp-knitted products is facilitated.
And (3) according to a conventional warping operation flow, finishing the PBT/PET composite yarns, the polyester filament DTY and the polyester monofilaments according to a certain warping head part.
According to the conventional warping operation flow, cotton yarns are arranged according to a certain warping head, the cotton yarns are divided into two layers at intervals by a metal yarn dividing rod during warping, a photoelectric hairiness detection device is closed, white oil is coated on the surface layers of the cotton yarns by an oil filling device, the surface hairiness is made to be attached to the trunks of the cotton yarns, and the flexibility and the knittability of the cotton yarns are improved.
The warping machine is applied with a uniform tension warping technology, namely, a hydraulic damping compensation tensioner is arranged on the warping machine, so that the requirement of warp knitting warping on tension is met.
3. Weaving process
Machine parameters:
the yarn laying movement diagram is shown in figure 1:
model: a double needle bar raschel machine RD 4N;
machine number: 22 needles/25.4 mm;
breadth: 138 inches.
Warp knitting organization structure:
GB1 comb: 3-3-3-3/0-0-0-0//;
GB2 comb: 1-0-0-0/1-2-2-2//;
GB3 comb: 1-0-1-2/2-3-2-1//;
GB4 comb: 1-1-1-2/1-1-1-0//.
Raw materials and a threading mode:
GB1 comb: the 100D PBT/PET composite yarn is fully penetrated;
GB2 comb: 32s cotton yarn, full penetration;
GB3 comb: 30D monofilament terylene fully penetrating;
GB4 comb: 100D half-light polyester DTY, full penetration; .
Inputting the digital number of the tissue lapping, the let-off amount, the drawing density and the like into a computer display screen of a control cabinet, storing, loading a computer file and starting the machine.
The tension spring of the warp knitting machine tension rod is adjusted, the length of the tension spring of the cotton yarn is lengthened to be 1.5-2.5 times of that of the tension spring for the common polyester filament yarn, the diameter of the tension spring is changed to be 0.5-0.8 time of that of the tension spring for the common polyester filament yarn, and tension compensation of the cotton yarn is increased so as to adapt to strength requirements and high-speed production of the cotton yarn.
And (4) obtaining blank cloth after weaving, weighing, bagging and warehousing the blank.
4. Finishing process
Shaping by a shaper, wherein the temperature of an oven is 140 ℃, and meanwhile, the required width and gram weight of the cloth are controlled; after cooling, the base layer of the warp-knitted double-layer fabric or the sandwich-structure fabric is compounded with the elastic polyurethane coating glue, and the total glue amount of the two surfaces is 100g/m2Drying at 120 deg.C at a rice speed of 15m/min, inspecting, weighing, packaging, and warehousing。
The leather-like fabric can be obtained through the processes; the sinker that contains two lamellas is not adopted in the surface fabric of warp knitting sandwich structure, because of the elasticity nonconformity of surface course and basic unit, leads to the surface course to be in the time of the design, and the surface course is inconsistent with the shrinkage of basic unit to cause the pincher trees phenomenon of surface fabric.
The specific production process is shown in the table 2:
TABLE 2
Comparative example 2
A three-layer imitation leather knitted composite fabric comprises a base layer, a surface layer and a core layer; the base layer is non-woven fabric made of polypropylene resin, the core layer is sponge, and the surface layer is knitted polyester cotton single jersey; the base layer provides proper stiffness and fabric texture for the imitation leather fabric, the sponge of the core layer provides compression resilience for the fabric, the surface layer provides basic hand feeling for the imitation leather fabric, and the polyurethane coating is carried out on the surface of the base layer because the base layer is made of non-woven fabric and has small extensibility.
The preparation method comprises the following steps:
1. prefabricated fabric
Uniformly coating a hot melt adhesive on the surface layer, then placing a core layer-sponge on the hot melt adhesive, then coating the hot melt adhesive on the sponge, and then placing a non-woven fabric on the hot melt adhesive to form a prefabricated fabric;
2. heating of
Heating the prefabricated fabric, wherein the heating temperature is 90 ℃, and the heat preservation time is 20 min;
3. polyurethane coating composition
The surface of the base non-woven fabric is compounded with elastic polyurethane coating glue, and the total glue coating amount of the two surfaces is 100g/m2Drying at 120 deg.C at a rice speed of 15m/min, inspecting, weighing, packaging, and warehousing.
The three-layer imitation leather knitted composite fabric can be obtained through the process.
According to FZ/T01051.2-1998 compression Properties of textile materials and textile products part 2: the constant pressure method in "measurement of continuous compression characteristics" was carried out on a YF-900 type universal material instrument. The compression performance of the fabrics of example 1 and comparative examples 1 and 2 after 1000 times of heavy pressing is tested, the flatness of the fabrics is evaluated, and the test results are shown in the following table 3:
table 3 test results of example 1 and comparative examples 1 and 2
| Test items | Strain/% | Flatness/grade |
| Test standard | FZ/T 01051.2—1998 | AATCC 124 |
| Example 1 | 34％ | 4.1 |
| Comparative example 1 | 47％ | 2.8 |
| Comparative example 2 | 76％ | 4.2 |
As can be seen from table 3: compared with the comparative example 1, the PBT/PET composite yarn in the example 1 adopts the special sinker, so that the let-off amount is increased, the flatness of the fabric is greatly improved after the sizing treatment, and the wrinkle condition caused by the inconsistent elasticity of the surface layer and the base layer is improved; compared with the comparative example 2, the fabric of the example 1 has small strain after 1000 times of heavy pressing, which shows that the compression resistance is good.
Claims (10)
1. A method for preparing a light anti-compression warp-knitted elastic imitation leather fabric is characterized in that a fabric with an integrated warp-knitted sandwich structure woven by a 4-bar double-needle-bed warp knitting machine is used as a base material of the imitation leather fabric and is compounded with an elastic polyurethane coating to obtain the light anti-compression warp-knitted elastic imitation leather fabric; the warp knitting sandwich structure fabric is knitted by four guide bars, the guide bars GB1 and GB2 are fully penetrated and only padding yarns are arranged on a front needle bed, and a surface layer is formed by a knitting chain and a weft insertion tissue; a guide bar GB3 is fully penetrated and connected with the front needle bed and the rear needle bed to form a sandwich layer of a sandwich structure; the guide bar GB4 is fully worn and only forms a loop on the back needle bed, and a base layer is formed by a warp flat structure; the guide bar GB1 adopts elastic yarn, and guide bar GB2, guide bar GB3, guide bar GB4 adopt non-elastic yarn, and simultaneously, the knitting in-process adopts the sinker that contains two lamellas, and the height of lamella jaw 1 is higher than lamella jaw 2, and elastic yarn passes through lamella jaw 1, and non-elastic yarn passes through lamella jaw 2 for elastic yarn's let-off volume is 600 ~ 800 than non-elastic yarn.
2. The method of claim 1, wherein the warp knitted sandwich face fabric is woven in a one-comb weave and through-yarn pattern of:
GB1 comb: 3-3-3-3/0-0-0-0//, compilations;
GB2 comb: 1-0-0-0/1-2-2-2//, compiete;
GB3 comb: 1-0-1-2/2-3-2-1//, compilations;
GB4 comb: 1-1-1-2/1-1-1-0//, full penetration.
3. The method of claim 1, wherein the warp knitted sandwich face fabric is woven from a single comb of yarns consisting of:
GB1 comb: 50-150D PBT or PBT/PET composite yarn;
GB2 comb: one of 32 s-40 s cotton yarn, 32 s-40 s viscose yarn, Nm 54-70/1 wool yarn and 75-100D polyester yarn DTY;
GB3 comb: 20D-40D polyester monofilament;
GB4 comb: 75-100D polyester yarn DTY.
4. The method according to claim 1, wherein the proportion of the yarns adopted by the single comb tissue in the weaving of the fabric with the warp-knitted sandwich structure is as follows:
20-60% of PBT yarn or PBT/PET composite yarn, 0-40% of cotton or wool yarn or viscose yarn, 0-20% of polyester monofilament and 20-50% of polyester yarn DTY; "%" is mass percent.
5. The method as claimed in claim 1, wherein the method for preparing the light compression-resistant warp-knitted elastic leather-like fabric specifically comprises the following steps:
(1) selecting materials: selecting 50-150D PBT or PBT/PET composite yarns, 32 s-40 s cotton yarns or 32 s-40 s viscose yarns or Nm 54-70/1 wool yarns, 20D-40D polyester monofilaments and 75-100D polyester yarns DTY as raw materials;
(2) warping: warping PBT or PBT/PET composite yarns, cotton yarns or viscose yarns or wool yarns, polyester monofilaments and polyester yarns DTY on a computer copying warping machine according to the width and the transverse density according to a certain number of parts;
(3) weaving: weaving by adopting a 4-bar double needle bed raschel warp knitting machine, wherein the PBT yarn or the PBT/PET composite yarn passes through the jaw 1, and other raw materials pass through the jaw 2;
(4) and (3) after finishing: shaping; cooling; compounding the fabric with the warp knitting sandwich structure with the elastic polyurethane coating;
(5) and (6) detecting and packaging.
6. The method according to claim 5, wherein the jaw 1 is higher than the jaw 2 in the step (3), and the wool gray having a light compression-resistant fabric style is obtained after weaving.
7. The method according to claim 5, wherein the step (4) of compounding the fabric with the warp-knitted sandwich structure with the elastic polyurethane coating is to coat the elastic polyurethane coating on two sides of the fabric with the warp-knitted sandwich structure, and the total coating weight of the two sides is 50-100 g/m2(ii) a Then drying at 90-120 ℃ at the drying speed of 10-15 m/min.
8. The light compression-resistant warp-knitted elastic leather-like fabric prepared by the method of any one of claims 1 to 7.
9. The light compression-resistant warp-knitted elastic leather-like fabric according to claim 8, wherein the square meter gram weight of a finished product is 220-430 g/m2。
10. Use of the lightweight compression-resistant warp-knitted elastic leather-like fabric according to claim 8 in the production of industrial textiles.
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